THE STORY FROM:

The Namek SAGA:

Because Piccolo and Kami are in the other dimention, no-one can be wished back with the Dragonballs.
So Gohan, Krillin and Bulma take of to Namek to find the Dragonballs there and wish all their friends back.
At the same time Vegeta got back on Freeza's planet. Where he will be revived in a heal-capsule.
And he is determened to get the Dragonballs too.

When our friends have arrived at Namek. They sence a terrible Powerlevel. It's Freeza the strongest mutant in the universe and his 2 best fighters: Zarbon and Dedoria.
Freeza is even stronger than Vegeta. He is looking for the Dragonballs too. He heard Vegeta trough the scouter talking about it. And now she wants to wish to live forever.
He allready has 3 of the 7 Dragonballs. He found them with the scouter. Now she stands before a house of a Namek who has a Dragonball.
Krillin and Gohan are there too. But they can't do anything because he's too strong.

Freeza forces the Namek to give the Dragonball the him, but the Namek refuses and get's killed by Dedoria. She also wants to kill the kids from the Namek, but Gohan comes to the resque and kicks Dedoria before she could kill Dende: the Namek kid.
Krillin, Gohan and Dende fly away and Dedoria follows them.
But at the same time Vegeta has arrived at Namek and sences Freeza too, but he also feels Gohan and Krillin. He went to search them.

Vegeta sees Dedoria while searching Gohan and Krillin and he wants to kick her ass. When he got there he started talking and Dedoria sees that Vegeta is weaker than herself, but what she doesn't know is that Vegeta can hide his PowerLevel.
They start fighting and Dedoria explaines to Vegeta that he can't win. But she got killed by Vegeta, but before she dies she tells Vegeta what happened to the home-planet from Vegeta. She tells that the planet was destroyed by Freeza.